Design of Reactor Coolant Systems in Nuclear Powerplants

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In the design of the RCS, consideration should be given to ensuring the integrity of its pressure boundary and to providing a high level of operational reliability. In addition, the leak before break concept or techniques of break preclusion should be considered for use in mitigating the consequences of localized failures. 5. Undue challenges to the integrity of the RCS should be prevented. g. by means of the measurement of operating parameters for heat transport, monitoring for leaks of reactor coolant and the detection of loose parts in the system); — To ensure that failures in the RCS outside the reactor vessel do not result in significant radiological consequences for the public.

8 In many States, the specified interval for volumetric inspection of the pressure boundary of light water reactors is 8–10 years; however, in practice, part of the RCS is inspected each year so that the entire pressure boundary inspection is completed within the specified intervals. 81. If SSCs important to safety are shared between two or more nuclear power reactors, it should be demonstrated that all the safety recommendations and considerations are met for each reactor. In the event of a design basis accident involving a reactor that shares SSCs with other reactors, it should be demonstrated that an orderly cooldown and removal of residual heat are achievable in the other reactor(s).

12]. 8 In many States, the specified interval for volumetric inspection of the pressure boundary of light water reactors is 8–10 years; however, in practice, part of the RCS is inspected each year so that the entire pressure boundary inspection is completed within the specified intervals. 81. If SSCs important to safety are shared between two or more nuclear power reactors, it should be demonstrated that all the safety recommendations and considerations are met for each reactor. In the event of a design basis accident involving a reactor that shares SSCs with other reactors, it should be demonstrated that an orderly cooldown and removal of residual heat are achievable in the other reactor(s).

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